Cisco Expressway Administrator Guide (X15.4) - Zones and Neighbors

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X15-4/exwy_b_cisco-expressway-administrator-guide-x154/exwy_m_zones-and-neighbors.html

Published

2026-02-09

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco website terms of use; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• Default Zone access rules (Configuration > Zones > Default Zone access rules) control which external systems may connect to the Expressway over SIP TLS via the Default Zone. in context
• The Default Zone represents incoming calls from endpoints or devices that are unregistered or not recognised, which is where unsolicited inbound B2B calls arrive. in context
• All calls through the Default Zone consume Rich Media Session (RMS) licences, so appropriate zones and rules should be created to avoid needless RMS consumption. in context
• A DNS zone's TLS verify setting controls whether the Expressway checks the X.509 certificate of the destination server returned by the DNS lookup. in context
• A DNS zone's Fallback transport sets the SIP transport used when NAPTR records and SIP URI parameters give no preferred transport. in context
• When Include address record is enabled on a DNS zone, the Expressway queries for A or AAAA records, and if any are found it does not query lower-priority zones. in context
• The DNS zone's Modify DNS request option routes outbound SIP calls to a manually specified SIP domain instead of the domain in the dialled destination. in context
• Traversal clients must always authenticate to the traversal server, and each traversal client zone specifies a username and password. in context
• Expressway zone types are Neighbor, Traversal client, Traversal server, DNS, ENUM and Unified Communications traversal, plus a built-in Default Zone. in context

Cite this source record

APA

WarmTransfer. (2026, February 9). Cisco Expressway Administrator Guide (X15.4) - Zones and Neighbors. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-exwy-admin-x154-zones-neighbors

BibTeX

@misc{warmtransfer-cisco-exwy-admin-x154-zones-neighbors,
  title  = {Cisco Expressway Administrator Guide (X15.4) - Zones and Neighbors},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-exwy-admin-x154-zones-neighbors},
  note   = {Cisco Systems, accessed 2026-09-25}
}